.box{
position: relative;
}
.box:hover{
    filter: grayscale(30%);
    content: "预览";
}
.box:hover .yulan{
    display: block;
}
.yulan{
    font-weight: 700;
    width: 40px;
    height: 20px;
    font-size: 20px;
    position: absolute;
    top: 50%;
    left: 80%;
    display: none;
}
.bigBox{
    position:fixed;
    width: 100vw;
    height: 100vw;
    top: 0;
    left: 0;
    z-index: 999;
    background-color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    display: none;
}
.bigBox>img{

}

